Terminal Server App wants a new certificate

I have a site that has an SBS 2008 box (HW2008) and a terminal server (HW2008TS) running a remote app that remote users have been connecting to without a problem.

The self issued certificate from the SBS box was installed on the remote users PC's - it hasn't expired

all of a sudden the connection to the remote app has started displaying a notice that the remote computer could not be authenticated due to problems with it's security certificate.

but the certificate reference in the dialogue indicates the remote computer as the terminal server HW2008TS which as far a I know has no system capable of issuing a certificate. - "the certificate is not from a trusted certifying authority."

issued to HW2008TS.local
issued by HW2008TS.local

I suppose i'm asking why has the certificate requirement changed?
and where has this certificate come from?

installing the certificate in the trusted root doesn't allow access to the remote app.

Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.

NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…